Vehicle top mount mirror support arm



FIG. 1 is a right front perspective view of a vehicle top mount mirror support arm showing our new design, the vehicle portion shown in broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a side elevation view thereof. 

The ornamental design for a vehicle top mount mirror support arm, as shown and described. 